Massachusetts put in place temporary pandemic rules from 10 March 2020 to 13 September 2021 saying nonresident employees who worked in Massachusetts before 10 March 2020 are still subject to Massachusetts tax until 13 September 2021.
https://solarifinancial.com/what-the-massachusetts-work-from-home-tax-means-for-nh-residents/
https://www.eagletribune.com/news/nh-moves-to-shield-remote-workers-from-out-of-state-taxation/artic...
